Stop Mavericks from opening apps on the second screen?Yes, that's exactly the problem. Everything opens on the smaller, secondary screen, even though I want things to open on the big main display! But, re-arranging the secondary display down by a bit did fix the problem! I don't know where you got that idea, but it's brilliant, thank you so much! Going to update my radar and hope that it's fixed in 10.9.1 (it wasn't there throughout 10.7-10.8).

Login items with niceness other than 0@Gerry I tried a cold boot without autostart apps (same account, just without login items), and it is much faster! I'm not sure if a niceness of -20 is actually going to help, but at least in theory it does throttle I/O and networking by a lot (and as far as I can tell that's what's slowing down the system start)

Dec1

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Login items with niceness other than 0@Gerry Indeed they will, but they still slow down the system start by performing a lot of I/O and networking on startup (Tweetbot and Reeder were just two examples of background idle apps). I want them to idle, and I want them to autostart, but I don't want them to slow down system starts.